is_value_required
Use these simple Tags to mark Instances as True or False: #is_//value_required #is/not_/value_required
Or write it as a Triple: [ is_value_required :: Boolean ]
Whether the property must be filled in to complete the action. Default is false.
Predicate describes that: [ #has_/domain :: PropertyValueSpecification ] ( #has_/name :: is_value_required ) ( #has_/range :: Boolean )